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Geochemical Baseline Values Determination and Evaluation of Heavy Metal Contamination in Soils of Lanping Mining Valley (Yunnan Province, China)

Author

Listed:
  • Zuran Li

    (College of Horticulture and Landscape, Yunnan Agriculture University, Kunming 650201, China)

  • Judith Deblon

    (BIOSE Department, Soil-Water-Plant Exchanges, University of Liège, Gembloux Agro-Bio Tech, 2 Passage des Déportés, 5030 Gembloux, Belgium)

  • Yanqun Zu

    (College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China)

  • Gilles Colinet

    (BIOSE Department, Soil-Water-Plant Exchanges, University of Liège, Gembloux Agro-Bio Tech, 2 Passage des Déportés, 5030 Gembloux, Belgium)

  • Bo Li

    (College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China)

  • Yongmei He

    (College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China)

Abstract

The largest lead/zinc mine in China is located in Lanping mining valley. The real impact of mining activity on the Lanping mining valley has not been studied to date. This study aims to characterize the geochemical baseline values and risk assessment of heavy metal contamination in soils of a study area located in the Lanping mining valley including upstream, mining and downstream areas. The results showed that the mean soil pH value was 6.8, and organic matter was 34.3%, in surface layer of the mining area. The mean soil pH value in the upstream and downstream areas was less than 5.5. The concentrations of Pb and Zn in the mining area were 56 and 47 times above the world average, the concentrations of Pb, Zn and Cd in the upstream area were six, seven, and six times above the world average, and the concentrations of Pb, Zn and Cd in the downstream area were eight, eight, and 18 times above the world average, respectively. The proposed geochemical baseline values of Pb, Cu, Zn and Cd were 169.93, 31.81, 569.06 and 4.13 mg·kg −1 , respectively. The pseudo total and ethylene diamine tetraacetic acid (EDTA)-extractable concentrations of Pb, Zn and Cd showed similar tendency as follows: mining area > downstream area > upstream area. The contamination degree with the geoaccumulation index (I geo ) and the improved Nemerow index (I IN ) in the upstream and mining areas was non-contamination or slight contamination with low or moderate risk with the individual ecological risk index (E r ) and the comprehensive potential ecological risk index (RI), although moderate or heavy contamination with pollution factor (Pi) and the Nemerow index (I N ). The contamination degree with I geo and I IN in the downstream area was non-contamination or extreme contamination with low or extreme risk with E r and RI. The results suggest that the I IN should be recommended to assess the soil contamination of heavy metals and the geochemical baseline values would be important for the environmental management and remediation of soils contaminated by heavy metals.

Suggested Citation

  • Zuran Li & Judith Deblon & Yanqun Zu & Gilles Colinet & Bo Li & Yongmei He, 2019. "Geochemical Baseline Values Determination and Evaluation of Heavy Metal Contamination in Soils of Lanping Mining Valley (Yunnan Province, China)," IJERPH, MDPI, vol. 16(23), pages 1-18, November.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:23:p:4686-:d:290541
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    Cited by:

    1. Rongkui Su & Qiqi Ou & Hanqing Wang & Yiting Luo & Xiangrong Dai & Yangyang Wang & Yonghua Chen & Lei Shi, 2022. "Comparison of Phytoremediation Potential of Nerium indicum with Inorganic Modifier Calcium Carbonate and Organic Modifier Mushroom Residue to Lead–Zinc Tailings," IJERPH, MDPI, vol. 19(16), pages 1-15, August.

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